Magnetic State Detection in Magnetic Molecules Using Electrical Currents
Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
A system with two magnetic molecules embedded in a junction between non-magnetic leads was studied. In this system electrons tunnel from the localized energy level in region one to the localized energy level in region two generating a flow of electric charge through the quantum dot system. The current density and thus the conductance changes depending on the molecular spin moment. In this work we studied molecules with either spin "up" or spin "down" and with symmetric coupling strengths. The results indicate that the coupling strength between energy level and molecule together with the tunneling rate through the insulating layer play a major role when switching from parallel to anti-parallel molecular spin, for a specific combination of the coupling strength and tunneling rate we could observe a decrease in the current by 99.7% in the non-gated system and 99.4% in the gated system.
Place, publisher, year, edition, pages
2015. , 49 p.
UPTEC F, ISSN 1401-5757 ; 15040
Magnetic Molecules, Nanoscale Systems, Spintronics, Molecular Spin Valve, Quantum Computing, Quantum Dot System, Nanoscale transistor, Nanostructures, Solid State Physics, Many Body Physics, Condensed Matter Physics, Green's Functions
Condensed Matter Physics
IdentifiersURN: urn:nbn:se:uu:diva-257094OAI: oai:DiVA.org:uu-257094DiVA: diva2:828201
Master Programme in Engineering Physics
Å12167, Ångströmlaboratoriet, Uppsala (English)
Nyberg, TomasBergman, Anders